Malicious PDF — malware analysis report

Static analysis result for SHA-256 57079fc723e941b4…

MALICIOUS

PDF

32.9 KB Created: 2020-09-06 09:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ebf4f0eb59ae8cbb0ab2366ee770a61 SHA-1: d438e0e341a7fa84b9a9c05a12a8c95ba13929d5 SHA-256: 57079fc723e941b47b00cb2c9d6333a78460668690f6d37dbfaae89ae887ca36
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'Arris cable modem tm822 manual' and the malicious URL itself, suggesting a lure for users seeking technical documentation. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, likely part of a link farm to improve search engine ranking for malicious content.

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.link/wix?keyword=arris+cable+modem+tm822+manual
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/xutifexebi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4029/3543/files/12516995618.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7098/files/alarm_no_sound_android.pdf
    • https://static.usrfiles.com/ugd/6a4619_9d908d0cf34a4c2badb16168f5e29d58.pdf
    • https://static.usrfiles.com/ugd/d902bb_8ecde5e4243048ddb16549d2754aedbb.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/67235710716.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/laseroboxap.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/betraying_big_brother.pdf
    • https://cdn.shopify.com/s/files/1/0438/1428/9568/files/oppositional_defiant_disorder_and_conduct_disorder.pdf
    • https://static.usrfiles.com/ugd/4733ca_0f1837fc511444bcbe35b900a5aee0d7.pdf
    • https://static.usrfiles.com/ugd/3e9e83_08973a8b5a864b46b7c70c8fb76f50f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa31fdb34c2c4170a71b12bf901b44b6.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043da.bin
4c2e88fb41de866eb502397745506dd8bfc016c2e2f187d1a9c7f5cffbef9c20
pdf-font-stream PDF embedded font (sfnt) at offset 0x43DA 5540 bytes
font_01_sfnt_off00005696.bin
a288a1681c94ce729bb13050dad08ff8b7092264151d567b2402aac9f6d1ff2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5696 9548 bytes