Malicious PDF — malware analysis report

Static analysis result for SHA-256 1885cb18827793d4…

MALICIOUS

PDF

47.7 KB Created: 2020-08-11 18:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98ea4d1abe6535b46a3c55d1131d6845 SHA-1: 6d68d2d257541834394b9aaadcb5fd19879df976 SHA-256: 1885cb18827793d48cc66e0a89665745909aef1abec300da8ff07101e95bcb07
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is disguised as a search result. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wb?keyword=korean%20hangul%20flashcards%20pdf
    • http://files.flygroundera.com/uploads/1/3/1/4/131438067/wuzopefoloxexetew.pdf
    • http://files.savvytravelsisters.com/uploads/1/3/2/6/132681647/e5e7a73a.pdf
    • http://files.gdni.biz/uploads/1/3/0/9/130969944/20b957aa54667.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/7219/1641/files/zadajinodidowosajisotiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/4130/8319/files/7_dwarfs_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/0773/8019/files/cute_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2490/files/49768080743.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/john_wick_chapter_2_1080p_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0430/8221/9674/files/31795296744.pdf
    • https://cdn.shopify.com/s/files/1/0438/0209/9873/files/bukokemiripow.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0541/files/ncert_biology_class_12_in_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0430/3739/3049/files/ielts_writing_task_2_tips.pdf
    • https://cdn.shopify.com/s/files/1/0430/0229/8521/files/zuvanemovinoxubexirasib.pdf
    • https://cdn.shopify.com/s/files/1/0437/7876/9045/files/weed_wacker_repair.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://www.brainscape.com/subjects/hangul
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b02.bin
ab05479965419369c2e901205e0fc060a90c865a87645c4b7137adda570a18fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B02 3820 bytes
font_01_sfnt_off000068cc.bin
c174f75584ecdefed55281812355fe283f6a606ffef6670c5d71c599dcc27d25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68CC 5140 bytes
font_02_sfnt_off00007a40.bin
0fbc14ff8f9eb3570ab8a9fa840641845d1cea1da0d1480e2657231e0394fc13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A40 12428 bytes
font_03_sfnt_off0000a1d6.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D6 4324 bytes

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