Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f5489a22ce87b8…

MALICIOUS

PDF

67.1 KB Created: 2020-08-15 01:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e257eb520e5f3950be04db12638227a7 SHA-1: f45baa7dc0c02a5e7eba44f8e58660ec67852ed3 SHA-256: 61f5489a22ce87b892ecffedaa33bc70d394e4f12c76a43b226fb65923819149
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating a malicious advance-fee scam lure, including links to known redirectors and a large number of external PDF links. The document body, though partially corrupted, contains a URL that appears to be part of the scam. The presence of embedded URLs and the ML classifier output strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=salary+certificate+format+doc
    • http://xidaxet.pvawrites.org/uploads/1/3/0/7/130776321/linejawomalixuzo.pdf
    • http://files.komunitiruqyahsyariyyahsingapura.com/uploads/1/3/0/7/130739288/kazafavitovonizuvuva.pdf
    • http://xikaset.sixdegreeswriter.com/uploads/1/3/1/4/131453060/tiruxegasala.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7710/7865/files/effects_of_stress_on_the_human_body.pdf
    • https://cdn.shopify.com/s/files/1/0440/0549/0846/files/adobe_fill_and_sign_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/70418702872.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/25917977954.pdf
    • https://cdn.shopify.com/s/files/1/0440/5297/1685/files/maytag_refrigerator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/1815/6192/files/ssc_book_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6770/2432/files/dating_game_theme_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/0544/4259/files/25464796073.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0489/files/86021515326.pdf
    • https://cdn.shopify.com/s/files/1/0435/8022/7747/files/gosakivagojegizosenij.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/o_paradoxo_da_escolha_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfc0.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC0 2828 bytes
font_01_sfnt_off0000c9ba.bin
6391962f206900151a9546bcdfc132d991b015023dcc3910f4b5715a5fc82b3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BA 5196 bytes
font_02_sfnt_off0000db4c.bin
b6eabfac78e1f068d1f8d2d6026a09a2b0c65965f5cae98450fbba0bb47a2c4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 10512 bytes

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