Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a77d81bad63ebbc…

MALICIOUS

PDF

40.8 KB Created: 2020-08-23 16:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f35ce6412d0c5758c951db1e82de6118 SHA-1: 777be0b8e34727d17538f7c046b6b4d908edf67e SHA-256: 7a77d81bad63ebbc28cfa0ccbf052ffa8242928ac61f128f538372af84a36aba
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to link farms and a known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to 'Cookout restaurant nutrition guide'. The presence of multiple external PDF links indicates an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=cookout+restaurant+nutrition+guide
    • http://dimema.terahlynn.com/uploads/1/3/0/8/130874431/zanawegaraxan.pdf
    • http://puxexu.cameratakilkenny.com/uploads/1/3/1/0/131071252/pezijo_norasinefor.pdf
    • http://rarijol.brucereevesswiftamericasartist.com/uploads/1/3/1/3/131383657/jelizedilelez-tisowe-gebanimarukiri-pukime.pdf
    • http://lajav.stephaniecpassman.com/uploads/1/3/1/4/131453177/2583864.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/28468909751.pdf
    • https://cdn.shopify.com/s/files/1/0434/9768/5157/files/8528093321.pdf
    • https://cdn.shopify.com/s/files/1/0437/1972/1115/files/bajavavivubefopimawitotuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/54064488579.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4658/files/jovofuzozomijesobisuzemu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/97444154336.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2067/files/69510139056.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8839/files/rational_numbers_class_8_worksheet_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/854548998.pdf
    • https://cdn.shopify.com/s/files/1/0445/6959/1967/files/10137063638.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/1638615557.pdf
    • https://cdn.shopify.com/s/files/1/0431/5394/8836/files/55009583007.pdf
    • https://cdn.shopify.com/s/files/1/0431/4382/3517/files/77090375750.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054f5.bin
4d7562ddadc848760bf651a8120367ee3c4f3e0f383077d3abf2e18a8889c51a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54F5 4928 bytes
font_01_sfnt_off000065cc.bin
282fdb69fe6081213a047edaf09bd1918adf80cdfa9defa4ef171396beff1143		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CC 14940 bytes

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